I've always tried to avoid ads as much as possible, throughout my life as far back as I can remember. If I Google for a Product I even scroll down below the 'ad' for the manufacturer and click on the straight google link lower down. Before the internet, I'd turn off the TV, go do something else etc. when the ads came on and avoid channels with excessive ad breaks (I live in Australia now and simply avoid the commercial channels altogether).
As others have also said, I do my own research for most of what I buy. I'm sure that over the years advertising has had a sublte effect on my brand perception, but I think it is limited and I will put personal experience way above any received info, especially from advertising.
So far as I am concerned the quicker that internet advertising dies the better. I remember back in the early-mid nineties (I guess I had internet access from around '94 through the university I worked at) how much nicer it was when everything wasn't filled with ads and most of the content was just from people with an interest in something. Sort of of like a giant Wikipedia with everyone formatting stuff however they liked and without the hideous tortuous English Wikipedia forces on writers. Ah, nostalgia.